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The Cometic MLS head gasket for Pontiac 400/428/455 V8 (4.380 inch bore) is built from multiple embossed stainless steel layers with a compressed operating thickness of 0.051 inch. Outer layers feature a Viton coating for heat resistance and reliable sealing; the center shim is uncoated stainless steel to permit precise thickness choices. This MLS design seals without sealants, tolerates mixed-metal head/block pairings, rebounds under load, and helps distribute clamping forces to reduce distortion.
Cometic Pontiac 400/428/455 V8 .051in MLS Cylinder Head Gasket - 4.380in Bore
